KTP 400, Recipe problem!

[tn121]

Hello, I am doing a project that requires the use of recipes, but I am having some difficulties. First I am trying the code with simulations and the thing that is not working is that the value of variables created in PLC is not changing, and HMI gives an error sayng that the connection with PLC is not established. I'm using S7-1200 cpu with KTP 400 HMI. So first I created some PLC tags for the elements of the plc, that I created the HMI tags and connected them with the plc tags, after that I created a recipe and added elements to that which are connected to hmi tags and created data records. I took that recipe and put it in the screen of HMI and after going online with the PLC and with HMI. When I try to put the data of that recipie into PLC I get the error that says that the connection is not established.
Any idea what should I do.
P.S When I try it with KTP 700 it works just fine!

[Hati]

Haven't used a KTP400 in a long time. Have you compared that both displays have the same functionalites available?

I always have the recipe control in the PLC it self, so it doesn't matter what HMI is used.